algebricks/algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/expressions/IVariableTypeEnvironment.java

/*
 * Copyright 2009-2013 by The Regents of the University of California
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * you may obtain a copy of the License from
 * 
 *     http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package edu.uci.ics.hyracks.algebricks.core.algebra.expressions;

import java.util.List;

import edu.uci.ics.hyracks.algebricks.common.exceptions.AlgebricksException;
import edu.uci.ics.hyracks.algebricks.core.algebra.base.ILogicalExpression;
import edu.uci.ics.hyracks.algebricks.core.algebra.base.LogicalVariable;

public interface IVariableTypeEnvironment {
    public Object getVarType(LogicalVariable var) throws AlgebricksException;

    public Object getVarType(LogicalVariable var, List<LogicalVariable> nonNullVariables) throws AlgebricksException;

    public void setVarType(LogicalVariable var, Object type);

    public Object getType(ILogicalExpression expr) throws AlgebricksException;

    public boolean substituteProducedVariable(LogicalVariable v1, LogicalVariable v2) throws AlgebricksException;
}